Community Forums

slow96z · 07-06-2012, 01:57 AM

My onan 4000 was running fine under way, but as soon as I turned off the coach engine it died and would not restart. I have no idea what the problem could be. It acts as if it's not getting fuel, if I hold the prime for a few seconds it will fire, but only for a second and dead again. I have 8 people on board and we are boon docking for the night. It's hot but we will be on shore power tomorrow. I'm mechanical and can fix it, just need advice on where to start looking.

Thanks in advance,
Justin

sdennislee · 07-06-2012, 02:25 AM

is the tank above 1/4? Always the first thing I check, generator fuel pick up tube stops at about a quarter tank to keep the generator from running the coach dry.

slow96z · 07-06-2012, 06:13 AM

I'm sorry for not specifying that. Yes, I have a little more than half a tank.

camperkids · 07-06-2012, 06:52 AM

You also have an oil level switch, make sure it's filled to the correct level. Just a thought. Jim

slow96z · 07-06-2012, 07:10 AM

The oil on the dipstick is between full and add, I can see the oil in the fill tube. Should I bypass the oil switch and try again?

Dunner · 07-06-2012, 07:49 AM

That would be a good place to start.

clyon51 · 07-06-2012, 09:19 AM

Any chance it's running hot? If you get it running a bit, make sure there is a good air flow coming out the cooling air exaust. These things can pick up debris, but mice nests are the major problem.

Gennys needs a 12vdc sourse for the control system. So when you said it died when you shut the engine off, this leads me to think you may have a low voltage problem in the coach. Probably just a coincidence, but trying with engine off, then again after it running 5 mins or so will tell a lot.

slow96z · 07-06-2012, 10:38 AM

I was looking at it while my friend was pumping gas and when the tank was full gas started spraying from under the gen. The fuel line had a split where it connected. Cut out bad line and it fired right up! Now I have to readjust back for altitude since I messed with that, but we are on the road with a/c!

Thanks for the help all!

George Schweikle · 07-06-2012, 10:43 AM

How old is your RV?. There have been lots of comments about generators running bad and the problem is resolved by replacing the entire fuel line from the main tank. if you had a split in one place, it's likely there is another one waiting to occur...

Quote:

Originally Posted by slow96z

I was looking at it while my friend was pumping gas and when the tank was full gas started spraying from under the gen. The fuel line had a split where it connected. Cut out bad line and it fired right up! Now I have to readjust back for altitude since I messed with that, but we are on the road with a/c!

Thanks for the help all!